Automatic drilling-jig.



' No. 827,790. v

.G. H. DARLING.

P ATENTED AUG. 7, 1906.

AUTOMATIC DRILLING HG.

APPLICATION FILED D30. 7, 1904.

OASSIUS H. DARLING, OF VVOROESTER, MASSACHUSETTS.

AUTOMATIC DRILLING-JIG- Specification of Letters Patent.

Patented Aug. 7, 1906.

Application filed December '7, 190 Serial No. 235,872.

To all whom it may concern:

Be it known that I, CASSIUS H. DARLING, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Automatic Drilling-Jig, of which the following is a specification.

This invention relates to an apparatus for handling small parts or pieces.

The special object of this invention is to provide an apparatus for automatically feeding and clamping small pieces in position to be drilled.

To this end this invention consists of the drilling-jig and of the combinations of parts therein, as hereinafter described, and more particularly pointed out in the claims at the end of this specification.

In the accompanying drawings, Figure 1 is a side view, partly broken away, of a drillingjig constructed according to this invention. Fig. 2 is a perspective View showing a small piece or blank clamped in position .to be drilled. Fi 3 is a detail View of some of the ieces w ich cooperate in holding a blank in p ace, and Fig. 4 is a detail View of the adjustable guide for the pusher. In manufacturing many classes of devices-such as firearms, type-writers, sewing-machines, &c.large numbers of small pieces are used.

In order to drill small duplicate pieces, the present machine-shop practice is to employ different forms of jigs or holders and to manually place the pieces or blanks to be drilled into these holders or jigs.

The especial object of my present inventi on is to provide a combined jig and feeding ap-- paratus which will handle the pieces or blanks to be drilled automatically, dispensing with the handling of separate pieces during the drilling operation.

Referring to the accompanying drawings and in detail, a drilling-jig constructed according to this invention, as herein illustrated, comprises a base piece or frame 10, having an upright or bracket 11 near one end thereof. Pivoted on the bracket 11 is a bellcrank lever 12. One arm of the bell-crank lever is connected to a vertical link which may be connected to the vertically-moving drill-head or which may be operated in any other desired manner. The other end of the bell-crank lever 12 is connected to a block 15-, which has a downwardly-extending projection sliding in a groove in the base 10. Connected with the block 15 is a rod 16, and fastened to the other end of the rod 16 1s a block or slide 17. Replaceably connected with the block or slide 17 is a plunger or pusher 18. The pusher is intended to move back and forth in the space between the cover-plate 19 and the vertically-adjustable feed-table 20. The feed-table 20 can be raised or lowered by means of screws, and the space between the cover-plate and feed-table is adjusted to correspond with the thickness of the piece which is to be fed to the drill. Different plungers or pushers 18 are employed, according to the thickness of the pieces to be drilled, and the end of each plunger or pusher 18 is shaped to correspond with pile part to be operated upon, as shown in ig. 2. I

Replaceably fastened upon the cover-plate 19 1s a reservoir or holder 21, which may contain a stack of blanks or pieces of Work W. By means of this construction as a pusher 18 is moved back and forth below the reservoir 21 blanks or pieces of work to be drilled will be successively moved forward over the feedtable andwill be carried into engagement with a removable and adjustable stop-plate 23.

Cooperating with the plunger or pusher 18 is a spring-pressed'arm22, which cooperates with the pusher and stop in clamping a piece of work in place and which also serves to push away a piece of work which has been drilled or bored by the drill D. When a piece of work is clamped in position to be drilled, the spring-pressed arm 22 is preferably swung back to a position at right angles with the stop-plate 23, the swinging motion of the spring-pressed arm being limited by a fixed piece 24. The plunger 18 when moved forward is intended to clamp the piece of work to be acted upon into the angle between the spring-pressed arm 22 and the stop 23. In order to adjust and guide the plunger 18 to secure exactly the desired clamping action, one side of the plunger 18, as shown in Fig. 3, is slightly beveled or inclined, and cooperating with the inclined side of the plunger 18 is an adjustable guide 25, which may consist of two pieces hinged together, as shown in Fig. 4, and which uide can be moved to different positions anf held in place by means of screws 26. By means of this ad ustment the plunger will be guided in its forward movement to crowd the piece or blank to be operated upon accurately into place and into contact with the spring-pressed arm 22 and stop 23, the comparatively small taper of the plunger producing a strong wedging action which will hold the work in place with great firmness while being operated upon.

By means of this construction it will be seen that I have provided a form of drillin j-ig which can be adapted to a considerab e variety of work by the use of a number of replaceable pusher-plates and by the replace ment of different magazines, which may be filled with pieces to be operated upon of different shapes.

The ma azines for the drilling-jig can be loaded or lled by hand or by automatic machinerysuch, for example, as already employed for feeding rivets or other small parts.

I am aware that changes may be made in practicing my invention by those who are skilled in the art without departin from the scope thereof as expressed in the cIaims, and I do not wish, therefore, to be limited to the construction which I have herein shown and described; but

What I do claim, and desire to secure by Letters Patent of the United States, is

1. In a construction of the class described, the combination of a feed-table, a pusher for conveying successive pieces over the feed-table, a movable arm-which is forced back out of the way while pieces are being drilled, and which has a path of movement at an angle to the path of movement of the pusher and acting to move successive pieces out of the way after they have been drilled, and means for restoring the movable arm to normal posi' tion when the pusher is withdrawn.

2. In a construction of the class described, the combination of a feed-table, a magazine, a pusher for conveying successive pieces from the magazine over the feed-table, a spring pressed arm located in the path of the pusher so as to be deflected thereby and acting to move successive pieces out of the way after they have been drilled.

3. In a construction of the class described, the combination of a support, a cover-plate connected thereto, a feed-table, and means for raising the feed-table to adjust thespace between the table and coverplate.

4. In a construction of the class described, the combination of a feed-table, a pusher conveying successive pieces over the feed-table, a fixed stop, and a side wall located at an oblique angle to the end of the pusher when the parts are in operating position, whereby a piece to be drilled will be, clamped in place from three sides while being operated upon.

57 In a construction of the class described,

the combination of a cover-plate, a magazine mounted thereon, a feedtable, and means for raising the feed-table to adjust the space between the cover-plate and feed-table according to the thickness of the parts to'be drilled.

6. In a construction of the class described, the combination of'a feed-table, stops or abutby the pusher to deflect the same latera ly to clamp the pieces in place while being drilled. 8. In a construction of the class described,

the combination of a feed-table, a pusher I conveying successive pieces over the feed-table, a fixed stop, a spring-pressed arm hav ing a path of movement at an angle to that of the pusher, and means for limiting the movement of the spring-pressed arm to'a position substantially at right angles a to the fixed stop, whereby work may be clamped in position between the inclined end of the pusher, the fixed stop, and the spring-pressedarm.

9. In a construction of the class described, the combination of a feed-table, a magazine, a pusher conveying successive pieces from the magazine over the feed-table, a fixed stop, a spring-pressed arm havin a path of movement at an angle to the pat of movement of the pusher, means for limiting the movement of the spring-pressedarmto a position substantially at right angles to the fixed stop, and means for crowding the pusher laterally to clamp successive pieces of work in place between the inclined end-of the pusher, the fixed stop, and the spring pressed I arm.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CASSIUS H. DARLING.

Witnesses:

PHILIP W. SOUTHGATE, JOHN F. CRowELL. 

